RESONANT COUPLING OF ELECTRONS AND EXCITONS IN AN APERIODIC SUPERLATTICE UNDER ELECTRIC-FIELDS STUDIED BY PHOTOLUMINESCENCE SPECTROSCOPY

被引：16

作者：

CAO, SM ^{[2
]}

WILLANDER, M

TOROPOV, AA

SHUBINA, TV

MELTSER, BY

SHAPOSHNIKOV, SV

KOPEV, PS

HOLTZ, PO

BERGMAN, JP

MONEMAR, B

机构：

[1] AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA

[2] LINKOPING UNIV,DEPT PHYS & MEASUREMENT TECHNOL,S-58183 LINKOPING,SWEDEN

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.51.17267

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on a low-temperature (2 K) photoluminescence (PL) investigation of a nine-quantum-well Al0.4Ga0.6As/GaAs aperiodic superlattice designed to obtain an electron quasiminiband in a desired electric field. The field dependence of the photoluminescence excitation spectra exhibits triple resonance of exciton states originally confined in three neighboring quantum wells and enhancement of the lowest energy exciton intensity due to localizing Coulomb interaction. In the vicinity of a field corresponding to the formation of the quasiminiband, we also observed a drastic quenching of the integrated PL intensity attributed to the fast carrier (electrons) escape through the high-mobility channel formed in the conduction miniband. A comparison of experimental results with numerical calculations of the exciton oscillator strength confirmed that exciton resonance occurred between strongly coupled Stark ladder states. © 1995 The American Physical Society.

引用

页码：17267 / 17270

页数：4

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